Lab to Grid: Underwriting the Nuclear Fusion Transition

Nuclear fusion technology has grown quicker than many expected over the past five years. What was once confined to experimental research has now progressed to pre-commercial demonstration, positioning it as a potential cornerstone of the future energy mix.

Following Tokio Marine GXs and Northcourt’s launch of the market’s first nuclear fusion insurance facility, we spoke with Mark Tetley (MT), a Senior Underwriter at Northcourt, and Eva Merpillat Guiraudet (EMG), an Underwriting Assistant & Sustainability Analyst at Tokio Marine GX, to understand:

• The development of fusion technology and how this market is expected to evolve in the coming years
• The unique risk profile for fusion technology projects compared to nuclear fission
• The shift this represents for the insurance market and the need for specialist underwriting
• How insurers can enable the growth of fusion technology from the lab to the grid

   

• In recent years, nuclear fusion technology has moved out from the laboratory and into the pre-commercial demonstration stage. What does the market look like today and how has it evolved?

  MT: What we are witnessing in the nuclear fusion space today is a transition from purely state-funded research, like the ITER Project, to a fast-moving private market that is increasingly attractive to new investors.

  The decisive factor in this shift is technological. The key breakthrough was achieving a nuclear fusion reaction where the energy output exceeds the energy input (Q>1), while maintaining a steady state of plasma. This milestone has pushed fusion out of the realm of speculation as it becomes a viable, and effective, option for clean energy generation.

  EMG: This breakthrough has altered the timeline for the nuclear fusion market. In practice, we are no longer just looking at research papers but seeing startups sign Power Purchase Agreements (PPAs) and develop full-scale supply chains. Signed commitments to procure and deliver power highlight that this is set to become a rapidly emerging market.

• Given nuclear fission’s exposure to potentially severe risks, can you explain how the risk profile for fusion technology differs from fission?

  MT: The risk profile for fusion technology is considerably lower than the risk profile for nuclear fission. From an insurance perspective, fission is associated with "catastrophic" risks like meltdowns or runaway chain reactions. Consequently, the insurance market for fission has been restricted. Fusion is different because it is a self-limiting process in that if the plasma confinement is disturbed, the reaction simply stops within seconds. This is why insurers and regulators should manage the two technologies differently.

  EMG: In contrast to the fission risk profile, which is low frequency but extremely high severity, the fusion risk profile is projected to be medium frequency with low severity, which is similar to various energy generating technologies today. The relative safety of fusion technology – the fact that the reaction produces no long-lived, high-level radioactive waste and uses inert helium as a by-product, is why regulators in the UK and U.S. are moving away from strict nuclear site licensing in favour of general health and safety frameworks.

• How much appetite is there amongst insurers to enter this burgeoning market?

  MT: Compared to fission, where the catastrophic nature of the risk made "pooling" essential to spread insurers’ exposures, fusion can benefit from a more open market, which is attractive to long-term nuclear players. Fusion is safer and can generate clean and affordable energy,  this makes for a competitive market similar to renewables despite fusion being technologically challenging.

  In terms of building a sustainable insurance market for fusion, there is a risk that a rush for market share amongst more standard carriers could take priority over accurately pricing the unique exposures that projects face.

  EMG: Although the stakes are lower for nuclear fusion risks, it remains important that project investments and revenues are properly protected for early-stage market confidence. We have seen insurance markets in renewables go through boom-and-bust cycles that can ultimately make for a hard market.

  Appetite to underwrite fusion projects must be reinforced with a willingness to develop deep understanding of the technology to secure long-term insurance capacity.

• What is the primary risk that nuclear fusion underwriters are prioritising for successful early projects?

  MT: As with any rapidly emerging market, the priority for underwriters is supporting projects through the uncertainty of First-of-a-Kind (FOAK) risk. FOAK risk is important to understand if there is no established track record or standardisation for these new technologies. Fusion projects combine multiple technical processes which increase exposure to aggregated risks. Management of these risks therefore requires a system-wide approach. Furthermore, insurers will need to understand how tritium is managed in each fusion venture. 

  To get ourselves, and the wider market, comfortable, we must differentiate between what is standard engineering and what is genuinely novel. At the same time, we must expand our knowledge of fusion operations with detailed risk analysis alongside technical experts and government advisers.

  EMG: The fusion process puts materials under extreme stress so a key point of focus for us is understanding the durability of the materials being used and the best practice for extending and optimising the life span of a project.

  Equally, at both ends of the project lifecycle - the immaturity of the supply chain for fuel and specialised components and the immaturity of waste management and decommissioning strategies – there is FOAK risk that must be proactively mitigated for long-term stability.

• Tritium is a key part of the fusion process. How do you evaluate the radiological risks of fusion?

  MT: Although fusion does not produce "high-level" waste of fission, it does use tritium, which is mildly radioactive. Its radiotoxicity is low, but it poses a risk if inhaled, ingested, or absorbed.

  Tritium certainly needs careful management at all stages of a fusion project. In the first instance, tritium is a byproduct of the reaction that takes place in Canada Deuterium Uranium (CANDU) fission reactors. Although there is an established global CANDU fleet, the supply of tritium is naturally limited to the number of CANDU reactors in operation and the capacity of tritium Removal Facilities. Therefore, tritium is not abundant and will need to be bred as part of the fusion process.

  EMG: The challenge for underwriters here is not meltdown but contamination control and supply chain security. Sectors, such as pharmaceuticals and research, have developed strategies for managing Tritium and it will be important for fusion insurers to learn from these. NC Fusion is working closely with technology leaders who are developing the systems to harvest and manage this fuel safely. As the sector grows, however, more supply will be needed.

• How can insurance facilities such as NC Fusion assist market growth?

  MT: Nuclear fusion’s readiness for commercial deployment now requires a careful underwriting framework to build up the market’s resilience. This may seem obvious to say but the straightforward nature of early-stage underwriting of elements such as physical assets and revenues can mask the complex challenge of developing PI coverage and product innovation later on.

  NC Fusion brings together Northcourt’s specialist nuclear underwriting experience and TMGX’s financial strength and leading track record in renewable energy.

  EMG: Unlike some other carriers entering the market now, NC Fusion is structured as a long-term specialist facility designed specifically for fusion risks; it’s about stabilising market growth and reducing volatility through a long-term commitment to the sector.

• How will NC Fusion evolve as the market moves toward full-scale commercialisation?

MT: As early movers in the space, NC Fusion’s strategy is clear: gather the knowledge and experience needed to underwrite good projects. As the market moves towards full-scale commercialisation with increased deployment and new entrants, we will have a refined and tested approach to lead the market in managing risks and exposures.

Our goal right now is to develop a robust claim protocol and a risk survey program that improves our familiarity with the technology’s risk profile. We want to ensure that as the market grows, NC Fusion remains the gold standard for specialist underwriting in this market.